North Koreans walk past near a huge screen broadcasting the government's announcement on North Korea's fifth nuclear test in Pyongyang, North Korea, in this photo released by Kyodo September 9, 2016. Mandatory credit Kyodo/via REUTERS

North Koreans walk past near a huge screen broadcasting the government’s announcement on North Korea’s fifth nuclear test in Pyongyang, North Korea, in this photo released by Kyodo September 9, 2016. Mandatory credit Kyodo/via REUTERS

North Koreans walk past near a huge screen broadcasting the government's announcement on North Korea's fifth nuclear test in Pyongyang, North Korea, in this photo released by Kyodo September 9, 2016. Mandatory credit Kyodo/via REUTERS

North Koreans walk past near a huge screen broadcasting the government’s announcement on North Korea’s fifth nuclear test in Pyongyang, North Korea, in this photo released by Kyodo September 9, 2016. Mandatory credit Kyodo/via REUTERS